GeForce GTX 660 vs Radeon R7 250X 2GB

Intro

Compare all of that to the Radeon R7 250X 2GB, which has a clock frequency of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
GeForce GTX 660		140 Watts
	Difference: 45 Watts (47%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 is 100% faster than the Radeon R7 250X 2GB overall, because of its higher bandwidth. (explain)

GeForce GTX 660		144192 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 72192 (100%)

Texel Rate

The GeForce GTX 660 should be quite a bit (approximately 96%) more effective at AF than the Radeon R7 250X 2GB. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 38400 (96%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 660 is a better choice, by a large margin. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 7520 (47%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.